How to convert hexadecimal to decimal
Multiply each digit by the base raised to the power of its position (counting from 0 on the right), then add the results.
Example
2AF₍16₎ = 2 × 16^2 + A × 16^1 + F × 16^0 = 687About the number systems
Hexadecimal
Base 16 uses 0–9 and A–F (A = 10 … F = 15). One hex digit is exactly four bits, so two hex digits describe a byte — used for colours (#FF8800), memory addresses and checksums.
Decimal
Base 10 is the everyday number system with digits 0–9; each position is worth ten times the one to its right.
Hexadecimal to decimal table
| Hexadecimal | Decimal |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| A | 10 |
| B | 11 |
| C | 12 |
| D | 13 |
| E | 14 |
| F | 15 |
| 10 | 16 |
| 1F | 31 |
| 20 | 32 |
| 3F | 63 |
| 40 | 64 |
| 64 | 100 |
| 7F | 127 |
| 80 | 128 |
| FF | 255 |
| 100 | 256 |
| 3E8 | 1000 |
| 400 | 1024 |
| 1000 | 4096 |
| FFFF | 65535 |
Frequently asked questions
How do I convert hexadecimal to decimal?
Multiply each digit by the base raised to the power of its position (counting from 0 on the right), then add the results. Example 2AF₍16₎ = 2 × 16^2 + A × 16^1 + F × 16^0 = 687
What is FF in decimal?
FF (hexadecimal) = 255 in decimal.
Can I convert very large numbers?
Yes. The converter uses exact big-integer arithmetic, so there is no rounding even for long inputs.